* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.main {
    min-width: 320px;
    max-width: 750px;
    margin: 0 auto;
    height: 100%;
}
html,
body {
    width: 100%;
    height: 100%;
}
ul,
ol {
    list-style: none;
}
h1 {
    font-weight: normal;
    font-size: 22px;
}
h2 {
    font-weight: normal;
    font-size: 20px;
}
h3 {
    font-weight: normal;
    font-size: 18px;
}
h4 {
    font-weight: normal;
    font-size: 16px;
}
h5 {
    font-weight: normal;
    font-size: 14px;
}
h6 {
    font-weight: normal;
    font-size: 12px;
}

a {
    text-decoration: none;
    color: #404040;
}
img {
    display: block;
}
